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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ba69d56684513881ec218a78be8a94a9e7ac6d46f4822755083f2d6b95e9b1' 
  AND token = 'PxP2sloHVNE+2EESReRk6Q7VeK5mz2AK6dAv0zbXgks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}